Road filling is often used to increase the width or height of road. In order to solve the problem that the designed grade of road filling slope is unstability and the method of decrease the grade of slope filling can’t be used to enhance the filling slope stability,because of the orographic condition limit,the concept of pre-reinforced by anti-sliding piles in road filling slope was proposed. The method of numerical simulation used to simulate designed slopes and four different pile sizes used in pre reinforced road filling slope. According to the analysis of the stability and distribution of equivalent plastic strain, the best pre reinforced pile size to reinforce road filling slope was obtained. The FEM method was adopted to analyze the value and distribution of soil pressure and pile displacement of selected pile.
